A simple microscope allows the observation of cells and many microscopic
organisms and their behaviors in different environments. In this
investigation, the process of plasmolysis is observed in onion cells.
A hypertonic solution (salty water) to the onion tissue is placed
onto it, thus forcing the water out of the cell. As the water comes
out of the cell, the cell membrane detaches from the the cell wall.
Other

Note: using a microscope camera is very efficient in showing
students what they need to see when using their own microscope.
Recording and saving images can be even more efficient, but a lot
of technique is necessary.